Mycncuk project sounds a fine idea. With regards to the of details of a plan and its consequences i.e. not willing to spoon feed and spec might not be suitable for the application. I think the reason why you want a ready design is that the reason for a DIY CNC router/mill is the cost and experimentation with design adds cost. I’m not sure about the worker/freeloader paradigm. As the worker did you generate all the knowledge you use? Are we not all in receipt of the ‘wealth of ages’ from our dead ancestors that we did not earn, pay for or deserve but merely inherited? (sorry for the pomposity).

Design wise I get the impression you either need several categories of machine or perhaps one design that is very scalable. Presumably the design approach is to define your requirements first then define a specification and from that sketch a few designs. Presumably if site users are prepared to define all possible requirements, perhaps from that there are sub groupings. I would like to know myself what the minimum spec for various types of tasks are e.g. what strength of frame/gantry, stepper torque and spindle power/rpm are required for say aluminium sheet cutting (can general rules of thumb be used to simplify the process). My guess at user requirements plus my own are:
Functions:3D recessed shapes, engraving, cutting sheets, etc.
Materials: Copper clad board, aluminium alloy(series? 1000, etc, tempering?), brass, copper, wood(hard wood, software, composite MDF/ply, carbon and glass composites, plastics (acrylic, etc), etc.